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Dispersion of ceramic nano-particles in the Al-Cu alloy matrix using two-step ultrasonic casting and resultant strengthening

机译:两步超声铸造法将陶瓷纳米颗粒分散在铝铜合金基体中并进行强化

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摘要

The work describes the dispersion of the Al_2O_3 nano-particles in the Al-3Cu matrix using a novel two-step ultrasonic casting technique and characterization of the bulk nanocomposite. As a result of Al_2O_3 dispersion by the two-step process, significant grain refinement, change in the grain morphology, and change in the morphology of the CuAl_2 phase were observed. The dispersion of nano-particles was uniform in a substantial fraction of grains. However, in the remaining grains, segregation near the boundary of Al-rich phase and CuAl_2 was observed suggesting pushing from both the ends. The reduction in grain size and change in the morphology of CuAl_2 were ascribed to the increased heterogenous nucleation rate due to the presence of Al_2O_3 nano-dis-persoids. The distribution was explained on the basis of deagglomeration due to the cavitation and influence of Cu on- (a) the wettability of the Al-Cu with A1_2O_3, and (b) pushing of nano-particles by the solidification front. The strengthening upon the dispersion was elucidated in terms of a climbing mechanism, which has been proposed earlier in the literature. The increase in the ductility was attributed to the lower extent of the in-homogeneity as a result of two-step ultrasonication in the nanocomposite as compared to the base alloy.
机译:这项工作描述了使用新颖的两步超声铸造技术将Al_2O_3纳米颗粒分散在Al-3Cu基体中并表征了纳米复合材料。通过两步法分散Al_2O_3的结果,观察到明显的晶粒细化,晶粒形态的变化以及CuAl_2相的形态的变化。纳米颗粒的分散在大部分颗粒中是均匀的。但是,在剩余的晶粒中,观察到富Al相和CuAl_2的边界附近的偏析,表明从两端开始推动。晶粒尺寸的减小和CuAl_2形貌的变化归因于由于存在Al_2O_3纳米异质体而导致的异相成核速率增加。该分布是基于由于空化和Cu对Cu的空化和影响而解聚的结果来解释的-(a)Al-Cu与Al_2O_3的润湿性,以及(b)纳米粒子被凝固前沿推动。早先在文献中提出的爬升机制阐明了对分散的加强。与基础合金相比,由于纳米复合材料中的两步超声处理,延展性的增加归因于不均匀程度的降低。

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